Lithoprinting table



M. C. HALE. LITHOPRINTINGITABLE. APPLICATION FILED MAY '28. 1-920. RENEWED EEB. 17,1921.

1,437, 1 4Q, Patented Nov. 28, 1922,

2 $HEETSSHEET 1.

M. C. H-ALE. LITHOPRINTING TABLE- APPLICATION FILED MAY 28.1920- RENEWED FEB- "M921- 1,437,140.

Patented ov. 28, 1922.

' 2 SHEETS-SHEET 2.

Patented Novo 23, 1922.

PTE'E' MERLE C. HALE, OF JERSEY CITY, NEW JERSEY, ASSIGNOR T0 LITHOPRINT COMPANY OF NEW YORK, INCL, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

LITHOPRINTING TABLE.

Application filed a 28, 1920, Serial 'No. 884,944.

To all whom it may concern:

Be it known that I, MERLE C. HALE, a citizen of the United States, and a resident of Jersey City, in the county of Hudson and State of New Jersey, have invented an Improvement in Lithoprinting Tables, of which the following is a specification.

This invention relates to work tables for use in the printingart and more particularly it relates to tables which have their work surfaces covered with chemical coatings.

One of the objects of this invention is to provide an adjustable work table which is movable into several positions to receive chemical coatings, to have printing operations performed thereon, and to have one or more surfaces under process of preparation as printing work is proceeding on another surface. i

A further object of this invention is to provide a method for preparing the surfaces of the table for the printing operations. Other and additional objects will be apparent from the description hereinafter follow- A selected embodiment of this invention is illustrated in the accompanying drawings. wherein Figure 1 is a view in elevation of a table in section and of its supports;

. Figure 2 is a sectional view of a header showing a portion of the support and a brake;

Figure3 is a top plan view of the table showing a trunnion in section and showing conduits for a cooling means in'dotted lines;

Figure 4 is a sectional view of one of the trunnions and of theintake conduit;

Figure 5 is a section of one of the headers taken on theline 55 of Fig. 3; and

Figure 6 is a sectional. viewtaken on'the line 6+6 of Fig. 3.

In the particular embodiment of the invention selected for illustration herein and shown in the drawings, a work table 1 upon which various operations of printing are performed is supported on the standards 2. This table preferably receives on its surfaces a combination of chemicals'known in this art as a gelatin. After-the gelatin is properly affixed to the surfaces of the table a master sheet is impressed upon the gelatin Renewed February 17, 1921. Serial No. 445,853.

and then removed and the gelatin inked if required. Duplicates of the drawing, writing or printing on the master sheet are then obtained by impressing blank sheets on the gelatin. These duplicates are preferably prepared by this method when the required quantity is more than can readily be produced on typewriters and is not sufliciently large to warrant the expense of setting up yp o Work tables are constructed in various sizes and may have one or more working surfaces, and they may be constructed from a unit article adapted to be supported in sev eral positions, or they may be built up by assembling various elements. In the illustrated embodiment which is of the built up type,

the table has two working surfaces 3 and 4 which are the exposed surfaces of heat conducting metal plates 5 and 6, which in turn are supported on pipes 7 received in two headers 8 and 9. The metal plates are preferably held on the pipes by tie-rods 10 which are fastened together by means of bolts 11 extending through the plates. The pipes 7 are assembled with their ends in the headers and tie-rods 12 assist in holding the two headers in position after assembly.

Preferably the ends of the pipes are screwed in header 8 as illustrated in Fig. 5. The pipe ends received in the header 9', are,

however, generally provided with collars 13 which are adjustable at equallengths from the header 8. The ends of the'pipes with the adjusted collars are received in openings 14 and for rotating the table with ease.

The table may be supported by any means, preferably by providing trunnions 17 and 18 on the headerswhich are held in the supports 2 so that the table may be rotated. The trun nions are securely positioned in the supports by means of face plates 19 which contact with both the supportsand the trunnions as illustrated in detail in Fig.4.; The table is preferably held in the horizontal and tipped positions by any well known means, as for example, brake straps 20 and 21 which opcrate on the trunnions, and preferably one strap is pulled in a'directionppposite' to the other strap. Connecting rods 22 are attached to the straps and to the foot lever 23 which is biased by a spring 2% in a position to continuously hold the straps tight on the trunnions. Preferably the foot brake has length equal to that of the table so that the operator can release the brake from any position along one side.

hen the table is in normal operating position it is preferably held in a horizontal plane and during the application of the gelatin it is generally tipped at an angle to the horizontal to permit the excess gelatin to drain.

A cooling or refrigerating agent is conducted in proximity to the working surfaces of the table to cool the gelatin. Provision is made in this illustrated table to have the cooling agent enter the table through the intake pipe 25 and follow through conduit 26 in the header 8 and course through the pipes 7 and short conduits 27 in the headers 8 and 9, and leave the header 9 by an outlet pipe 28. The inlet and outlet pipes 25 and 28 are preferably surrounded by any suitable packing 29 which is pressed into position by glands 30 which are in turn held by an adjustable fastening means such as screws 31. The chemical composition of the gelatin generally determines the cooling agent to be employed, but the conduits will conduct ammonia, methyl chloride, water of low temperature or other cooling agents.

The work surfaces are prepared for printing by applying a gelatin preferably in a liquid form. First the table is tipped at an angle to the horizontal and then the gelatin is applied in the liquid form and permitted to drain from the surface. During this last step the cooling agent is flowing through the conduits in the table and the low temperature congeals and afiixes a certain amount of the gelatin to the table surfaces. After the gelatin has been sufficiently drained the table is revolved and the other working surface brought to the top and the gelatin applied in like manner. After the application to thesecond surface, the table is revolved so that the first surface is brought to the top into the working position and the printing operations may be started immediately on this surface while the cooling agent is congealing and setting the gelatin on the second surface.

-When the gelatin on one surface has be come depleted the next surface is turned into working position and printing operations started. When the table has only two working surfaces, as in this instance, the gelatin is scraped after depletion and a new coating applied "and the table revolved to bring the repared surface into working position and to allow the new coating to become set.

The invention may :be variously embodied and the particular form of apparatus herein shown may be modified within the scope of the subjoined claims.

I claim:

1. In a work table the combination of two substantially parallel work surfaces being so mounted that they may be moved out of their normal working positions, and means interposed between said surfaces for receiving a means for varying the temperatures of said surfaces.

2. In a work table the combination of a conductive flat plate fixed to a support and adapted to receive a material to be cooled, means for associating a cooling agent with said plate, and holding means for maintaining said table in predetermined positions.

3. In a work table the combination of a conductive metal plate affixed to a rotating body and adapted to receive a gelatin, conduits for conducting a cooling agent near said plate to cool said gelatin, and means for holding said plate at an angle to the horizontal when said gelatin is applied.

4. In a work table the combination of a rotatable conductive metal plate for receiving a gelatin coating, conduits for conducting a cooling agent near said plate, and means for supporting said plate at an angle to the horizontal when said gelatin is applied and for supporting the table in the horizontal for working purposes.

5. In a work table the combination of a fiat liquid receiving plate affixed to a suitable body and adapted to be held at an angle to a vertical plane passing through the support for said body as said plate receives the liouid and held at another angle when work is being performed thereon, and a cooling means associated with one side of said plate for congealing said liquid on said plate.

6. In a revolving work table the combination of flat gelatin receiving work plates affixed to a body and adapted to be held at an angle to normal working position when receiving the gelatin, and a cooling system associatedwith said plates to cool the same when held in any position.

7. In combination, a flat work surface affixed to a body adapted to rotate, means for maintaining said surface at predetermined temperatures, and means for positively holding said surface in predetermined positions.

8. In combination, two work plates each adapted to receive thereon a chemical composition employed in making duplicate prints, a series of conduits mounted in relation to said plates to receive a temperature varying agent which will beefi'ective in maintaining both plates at a predetermine temperature.

9. In combination, two heat conducting work plates supported in parallel relation and adapted to receive thereon a chemical composition'employed in the process of making duplicate prints, said plates being so mounted that they may be rotated to have one of them in normal operating position for making the duplicates while the other is being prepared by having the composition congealed to form a coating over the plate, and a series of conduits interposed between said plates for conducting a cooling agent in proximity to said plates for congealing the composition and for maintaining it in congealed condition during the formation of the duplicates.

10. In a revolving work table the combination of gelatin receiving plates adapted to be held in draining and working positions, means for guiding a cooling agent near said plates to congeal some of the gelatin onsaid plates, and holding means for maintaining said plates in draining and working positions.

11. In combination a table having a cooling agent circulating. therein to maintain the external fixed surfaces of said table in cooled condition, supports for holding said table, and means for fastening said table in predetermined positions.

12. In combination with supports a work table having a header associated with one of said supports, refrigerating conducting means held by said header, a conductive plate held by said conducting means for receiving a material to be cooled, and means for holding the other end of said conductive means in another of said supports.

13. In combination with supports a work table comprising apertured headers having trunnions to be received by said supports, pipes for conducting refrigerating material held between said headers, conductive metal plates held on said pipes for receiving materials to be cooled, and a brake for holding said table in predetermined positions.

14. In combination with supports a r0- tating work table, trunnions on each end of said table and held in said supports by face plates, and inlet and outlet pipes in said trunnions to conduct a cooling medium adapted to cool the work surfaces of said table.

15. In a work table the combination of apertured headers having trunnions thereon, a series of liquid conducting pipes adjustably held in said headers, plates for receiving a gelatin held on said pipes, standards for rotatably holding said trunnions, means for holding said headers in predetermined positions in said standards, and inlet and outlet conduits for conducting liquid to and from said pipes.

16. In a work table the combination of apertured headers having trunnions thereon, a series of pipes received in said headers for conducting a cooling agent, rods for holding said pipes in said headers, conductive metal plates held on said pipes for receiving gelatin applied thereto, standards for receiving said trunnions, a brake means associated with said headers and carried by said standards for holding said headers in predetermined posit-ion, and inlet and outlet pipes for said cooling agent received by said trunnions.

In testimony whereof, I have signed my name to this specification this 25th day of May, 1920.

MERLE C. HALE. 

